we've seen that in other countries like in the united kim kingdom where people were traveling to pakistan, then they came back to the uk. the worry is that america has similar challenges and parallels. >> and apparently according to some reports i saw today, that's exactly what osama bin laden was hoping for, targeting specifically somalia and members of al shabaab to do just that, attack the u.s. according to u.s. officials, al qaeda is on the brink of collapse. if that happens, what other groups, what other factions would be ready to step in and fill the void? is that even what would happen? >> transnational terrorism has diversified. it's no longer about one group. bin laden's ideology has po live rated since 9/11. there are outfits who have their own resources, leadership, cell strauk chur, design and commitment to plot and commitment transnational attacks. one leading element has been the al qaeda franchise in yemen that has tried to target the united states over the last few year, especially going after the aviation industry. al shabaab which is next door in somalia is another group